Coffee Knowledge

Coffee beans pop during roasting as water vapor and gases build pressure inside them. Learn what causes first crack and how roasters use it without relying on sound alone.

The small valve on a coffee bag allows carbon dioxide from freshly roasted beans to escape while limiting outside air from entering. Here is how it works—and what it cannot...

The pale flakes collected after roasting are coffee chaff, which comes mainly from the silverskin surrounding the coffee seed. Learn why chaff separates, why amounts vary, and why the collector...